payson



(No Model.) 2 Sheets-Sheet 1.

v A. P. PAYSON. SETTING SPUD AND GAGE FOR DREDGERS. No. 418,471. Patented Dec. 81; 1889.

N. PETERS. Fhalmlilhbguphcr. Washington. DC.

(No Model.) 2 Sheets-Sheet 2.

' A. PHPAYSON.

SETTING SPUD AND GAGE FOR DREDGERS. No. 418,471. I Patented Dec. 31, 1889.

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PETERS. Pholo-uthognpfwr. Washin'g'on. D. C.

UNITED STATES PATENT OFFICE.

ALONZO P. PAYSON, OF-SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE GOLDEN STATE AND MINERS IRON WORKS, OF SAME PLACE.

SETTING SPUD AND GAGE FOR DREDGERS.

SPECIFICATION forming part of Letters Patent No. 418,471, dated December 31, 1889.

c 1 Application filed May 9, 1889. Serial No. 310,163- (No model.)

To all whom it may concern.-

Be it known that I, ALONZO I. PAYSON, of the city and county of San Francisco, State of California, have invented an Improvementin Setting Spud and Gage for Dredgers; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to a device for moving and setting the scow upon which a dredging apparatus is carried, so that the scow may be advanced to a certain distance, which distance is equal to the amount of out which can be excavated by the dredger.

It consists of a supplemental spud moving vertically in guides upon a frame at one side.

for a more complete explanation of my invention, Figurel is a plan view of the dredgeboat, showing my attachment. Fig. 2 is an enlarged side elevation of a portion of the scow, showing the relative arrangement of the attachment. Fig. 3 is a plan view of the same. Fig. 4 is a detached view of the bracetimber D and the strap and spud.

In this present case I have shown my device as applicable to what is known as a clamshell dredge, but it will be manifest that it might be also applied to other forms of dredges which are to be advanced a stated distance from time to time as the work progresses.

A is the scow or boat upon which the engines and dredging apparatus are carried, from the forward end of which a beam projects supporting the dredge-buckets. This beam swings from sideto side, and the material is excavated in a segment of a circle as the beam is caused to swing around its point of suspension, and after this segment has been excavated it is necessary to again advance the apparatus a distance equal to the width of the out which can be excavated by the dredger.

A supplemental triangular frame is formed by the vertical timber B, the horizontal timber C, and the diagonal bracing-timber D,

' which extends from near the-bottom of B to the outer end of C. The timbers B and D lie closely along the side of the scow. The timber C is bolted to the side of the brace-timber D, so that it lies inboard and above the edge of the scow, as shown in the plan views, Figs. 1 and 3.

E E are straps or yokes of iron secured one near the top of the vertical timber B and the other at a point where it is united to the brace-timber D, these yokes extending beyond the side of the timber B so as to form square openings through which the spud F may slide easily, Fig. 4.

G G arelcastings which are firmly bolted to the side timbers of the scow, and H II are stout bars extending horizontally between each pair of these castings and outside of the spud F and the vertical timber B of the supplemental frame. The horizontal distance between the castings G is equal to the distance which it is desired to move the boat or scow for each new cut, allowing also for the size of the spud and the vertical timber inclosed within the guide.

The horizontal timber C above described lies inboard and just above the side of the scow, and it is kept in this position by means of a vertical guide I, which is bolted to the scow and extends upwardly above the level of the timber C, and has a roller J, which extends above the timber so as to press upon the top of it. K isaplate of iron upon which this roller travels as the scow is movedwith I reference to the spud and the frame.

L L are plates of iron fixed upon the edge of the scow, and shoes M are fixed to the timber C so as to raise it above and out of contact with the top of the scow, and these shoes travel upon the plates L when the scow is moved, Fig. 2.

The operation will then be as follows: The scow is held in place while the work is going on by means of a spud N. The spud F is 7 also let down into the bottom of the channel 0, passing around the gipsy P and thence around the guide-pulleys Q, extends for- Ward and is attached to an eye upon the rear end of the horizontal frame-timber O. The

spud F and the frame-timbers B, O, and D i being stationary and independent of the scow, by reason of the spud being driven into the bottom of the channel, it will be seen that when the rope or chain is wound around the gipsy it will draw the scow forward as far as the open spaces within the guides H will allow, the spud being then at the rear end of the guide-spaces. The guide-roller J, a ove described, pressing upon the horizontal timber O, prevents the spud from being pulled over into an inclined position and acts as a guide traveling over the top .of the timber O as the scow moves forward, and at the same time holds this timber down in its horizontal position.

Chafing-plates are fixed upon the side of the scow opposite the guides in which the spud travels. When the scow has been advanced the length of these guide-spaces, the

spud N is again driven into the bottom of the,

channel, and the spud F, being raised, may be at any time advanced to the front end-of the guiding slot or channel, the frame B .O D

moving with it. When the spud F is again driven into the bottom, the hole is fixed and may remain until the out has been completed, when the scow maybe again advanced in the same manner.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, 15-?- 1. A device for advancing a dredger-scow,

consisting of a supplemental frame, a spud by which said frame-is secured to the bottom of the channel which is being excavated, said frame being connected with the scow by.

guides, and a rope or chain passing around a gipsy and guidepulleys on the scow and connected with the rear of the supplemental frame, substantially as described.

2. A device for moving a dredger-scow, consisting of a supplemental frame fixed alongside of the scow by means of a spud driven through guiding-yokes on the frame and into the bottom of the channel, in combination with the guides G H, Within which the spud is retained, said guides serving as a gage for the distance to which the scow is moved,substantially as described.

3. The supplemental frame consisting of the vertical timber B, the horizontal timber O, and a bracing-timber, and a spud passing through yokes at the rear end of said supple mental frame, the guiding-channels within which the spud is retained and by which the distance moved is regulated, in combination with a gipsy, a rope passing around it and guiding-pulleys and connected with the supplemental frame, and the roller J, pressing upon the top of the frame, so as to prevent its being lifted when the scow is advan.ced,

ALON'ZO P. PAYSON.

Witnesses W. E. PALMER, JOHN W. BROWN. 

